President Trump slammed Sen. Claire McCaskill as a "phony" on Twitter Wednesday after the Missouri Democrat admitted that she'd used a private plane on an RV tour across the state last month.

"Senator Claire McCaskill of the GREAT State of Missouri flew around in a luxurious private jet during her RV tour of the state," Trump tweeted.

The Washington Free Beacon first reported that McCaskill's single-engine turboprop plane followed the route the senator's RV ostensibly took across Missouri on the first two days of a "Veterans for Claire" tour on May 29-30.

According to the Free Beacon, McCaskill's campaign claimed that it had traveled 700 miles on the RV during the three-day tour.

Senator Claire McCaskill of the GREAT State of Missouri flew around in a luxurious private jet during her RV tour of the state. RV’s are not for her. People are really upset, so phony! Josh Hawley should win big, and has my full endorsement.